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$160.00 (USA and Canada only)

Availability: In stock
RS-232 to 422/485 Converter

Production Specification

RS-232 to 422/485 Converter


Power Requirements
(Optical Isolation Mode)

200mA @ +5 VDC
50 mA @ +12 VDC      Voltage Tolerace = ±0.1 VDC
50 mA @ -12 VDC

Power Requirements
(Non-Isolated Mode)

200 mA @ +12 VDC VDC 5      Voltage Tolerace = ±0.1
0 mA @ -12 VDC

Temperature Range

0 °C to 70 °C
0 to 95% Humidity (non-condensing)


4,000 VAC (RS-232 to RS-422)

RS-232 Interface

25-pin, DB-25 female connector

RS-422/485 Interface

Screw terminals

Baud Rate

Up to 38,400 baud
(Boards earlier than Rev.1 are limited to 19,200 baud)

RS-232 Distance

Up to 50 feet

RS-422/485 Distance

Up to 5,000 feet


RS-422 full duplex over two twisted pairs and a signal common.
Shielded cable recommended.
Does not support RS-485 2-wire mode (see AC7A/B)


Transmit, Receive


PC-Based I/O Overview

This document shows examples of system architecture for PC-based I/O control systems and lists Opto 22 products that work together for PC-based control. System examples include:

  • Ethernet systems using SoftPAC, a software-based programmable automation controller programmed with PAC Control
  • Ethernet systems using the OptoMMP protocol
  • Direct control of I/O using no I/O processor (no brain)
  • Serial control using a brain and the mistic or Optomux protocol
  • High-speed control using the Pamux protocol
NOTE: Before choosing to use a PC for control, consider groov EPIC.  A groov EPIC processor offers many features similar to a PC, such as a Linux OS with optional secure shell access; cybersecurity features; Ethernet, USB, and HDMI ports; and the ability to run the control program and HMI on the same hardware. In addition, a groov EPIC system offers real-time control using traditional programming languages; guaranteed-for-life I/O on the same chassis; industrial toughness for hazardous locations; and easier integration with company computer networks, manufacturing, business, and facility systems, and cloud-based services & software.

RS232 to RS422/485 Converter Data Sheet

The AC7 is a stand-alone adapter card that converts RS-232 serial communication to RS-422 serial communication, which is directly compatible with the  Optomux brain boards .

AC7A - AC7B Users Guide

This document gives instructions for installing the AC7A/B adapter card in an Optomux network in 4-wire RS-422/485 mode with a PC and how to communicate with equipment other Optomux.

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